TM 10-3930-671-24 8.5. Brake Bleeding Type 2 Dual Master Cylinders TA18 Transaxle Brake & Inching Circuit Bleeding................................................................. F-395 Hydraulic Brake Fluid and Bleeding Precautions ........................................ F-396 Bleeding Procedures ................................................................................... F-396 Brake & Inching Circuit................................................................................ F-397 Pressure Bleeding Procedure ..................................................................... F-397 Manual Bleeding Method - Service Brake Circuit........................................ F-398 Manual Bleeding Method - Inching Circuit................................................... F-399 Brake & Inching Circuit Bleeding The purpose of bleeding the brakes is to remove any entrapped air in the brake and inching system which would make the brake or inching pedal feel "spongy" and allow the  pedal  to  travel  without  proper  build-up  of  hydraulic  pressure,  thereby losing effective braking and inching. Normally, a minimum of brake bleeding will be required.  The combined brake and inching circuit is designed to place the brake  fluid  reservoir  at  the  highest  point  in  the  circuit.    This  ensures  that  the  major  part  of  any  air  that  has  entered  the system will flow upwards and vent into the  reservoir.    The  recommended  brake  bleeding  procedures  outlined  below  are intended to dislodge and remove any entrapped air from the circuit. NOTE To perform this service procedure, it is recommended that you first: Park truck on a level surface Return   all   controls   to   neutral   and   turn ignition key  switch  OFF,  unless  otherwise directed. Remove key from switch. Apply    parking    brake    and    block    drive wheels. GPX Model TA18 Transaxle Bleed   brakes   with   engine   off   (not   running).      Check frequently   and   keep   master   cylinder   reservoir   filled during bleeding. NOTE Use SAE/Type DOT 3 Heavy-Duty brake fluid. F-395

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